
function hengshuping(){ 
  if(window.orientation==180||window.orientation==0){ 
        alert("竖屏状态！")        
   } 
if(window.orientation==90||window.orientation==-90){ 
        alert("横屏状态！")         
    } 
 } 
window.addEventListener("onorientationchange" in window ? "orientationchange" : "resize", hengshuping, false);